Ribbed material The cups are a non-slip type. Only tried on, stored after washing. I want to clear these out quickly, so I've lowered the price (^^) 11-29 - Color: White - Design: Ribbed material Thank you for viewing. ☆ No pets or smokers ☆ Inspection, measurement, and packaging are done by an amateur. ☆ Items are stored at home and are used. ☆ Recycled packaging materials will be used. ☆ Simple packaging will be used. ☆ Wrinkles may occur due to packaging. ☆ Items may be deleted even if likes are received.